News:

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Does anyone know the correct PN (or numberS) for the correct fan clutch used on the BB '68's (ie. K02 option), ...OR have any photos that would uniquely identify one? (is it common to '67 and/or '69, etc.??)

The AIM calls out PN# 3916388, ..but I'm wondering that there are other numbers??

Not sure I'm going to be able to help you here since I'm not sure if my clutch is original! But here's what I have...

In group 1.050 of the P&A, it shows the following:

1966-1967 Chevelle (396), 1967 Camaro (6 Cyl), 1968 Camaro (396) - Drive unit - P/N 986067 Unfortunatly, this is for the clutch and the fan assembly and doesn't have a breakdown of the P/N's by themselves. And of course, this could be a generic replacement assembly.

Both my Hollander and Mitchell interchanges (1969 editions) show the 1968 Camaro 396 as P/N 3927103. It also shows the 1967-1968 Camaro 302, the 1967-1968 Chevelle 396 (375), the 1966-1967 Full Size (427/425) and the 1968 Full Size (427) as using the same clutch. (Mitchell interchange #551 and Hollader interchange #175)

As you said, the AIM shows P/N 3916388, but it also shows P/N 3927103 as bing "Optional". There's also a note (note 4) stating that the 3927103 "WAS 3916589" with the change being noted on November 1st, 1967.

Now, to confuse things even more, here are 2 pictures of my old fan clutch. There's wording stamped into both sides of the clutch with "OD" stamped in black ink on the front side (see the pictures...) I have no idea if it's original so take this with a grain of salt!

The coil-type unit in the top group of photos is the Eaton clutch, and the one in the lower group of photos is the plate-type Schweitzer clutch; although their part numbers were different, both were used interchangeably in all Chevrolet applications, depending on which one happened to be stocked on the line at the time. I don't have a '68 A.I.M., but you'll see the interchangeable usage in the '69 A.I.M.; both part numbers are shown, with the second part number "opt." (optional usage); both of them were calibrated the same way, met Engineering specifications for that application, and either one is "correct".

Ed, I don't have the part number or broadcast code info for 68's; I just know that both the Eaton and Schweitzer clutches were released as optional usages across all car lines in the 60's, as neither supplier could supply the total volume requirements.